... , Material: Aaluminum. 2, Max Air Pressure: 7 bar 1, QBY Type Air Operated Diaphragm Pump adopts and compresses the air pneumatically as the motive ... its detials as follows:. ItemMaterialMax Deliver HegtMax Grain DiameterSuction heightMax air pressureQBY-10ALU, IRON, PTFE0-50m 1 6 7barQBY-15ALU, ... 7barQBY-50ALU, IRON, SS, PTFE 50m 8 6 7barQBY-65ALU, IRON, SS, PTFE 50m 8 6 7barQBY-80 ALU, IRON, SS, ...